Ribbon spool for typewriting machines



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c. GABRIELSON RIBBON sPooL FOR TYPEWRITING MACHINES 2 SheecS-Sheet 1Filed April 14 3 mundo@ @Hoz MM45,

NOV. 13, ma mmm C. GABRIEL-SON RIBBON SPOOL FOR TYPEWRITING MACHINESFiled April 14 1922 2 Shee'LS-Sheei 2 Fatented Non. T3, ll.

UNET@ STATES CARL GBRIELSON, 0F SYRACUSE, NEW YORK, ASSIGNOR ltlllPATENT @FFTCCW T L. C. SMITH it BRQS.

TYPEWRITER C0., 0F SYRACUSE, NEW YORK, .d CQRPORATION OIF NEW YORK.

RIBBON SPOOL FOR TYPEWRITING MACEITNES.

Application tiled April M, i922. Serial No. 552,771.

To aZZ whom t may concern.'

Be it known that l, CARL GABRIELsoN, a citizen of the United States, andresiding at Syracuse, Onondaga' County, State o New York, have inventedcertain new and uesful Improvements in Ribbon Spools for 'llypewritingMachines, of which the tollowing is a specification.

The present invention relates to typewriting machines and particularlyto typewriter ribbon spools.

ln Patent No. 929,933 granted August 3, 1909, to the present applicant,a typewriter ribbon mechanism is disclosed by means ot which the ribbonis automatically advanced across the printing point, being unwound :fromone ribbon spool and wound up upon a second ribbon spool, the mechanismbeing designed and constructed so that the rotation ot the spools isreversed, and hence the movement of the ribbon, when the deliveringspool has become completely empty. The spools illustrated in this patentare, however, intended or continuous use with the machine, the freshribbons being wound thereon to replace used ribbons. rllhe re moval of aworn out ribbon and its replacement by a fresh ribbon involves theexpenditure of time on the part of the operator and it is the object ofthe present invention to prevent this loss ot operating time byproviding an inexpensive ribbon spool which may be supplied totypewriter operators with a length of ribbon wound thereon and whichspool may be quickly .substituted tor a spool ot worn out ribbon, thislast mentioned spool being then discarded. ylhe spool has a number ofnovel features of construction and the invention may be embodied invarious structures. ln the present application one form is fullydisclosed by way ot example.

' ln the drawings:

Fig. l is a vertical section through a ribbon spool shaft showing theimproved spool mounted thereon and the ribbon reversing mechanism whichcooperates with the spool;

Fig. 2 is a top plan view of the same with spool removed but itsoperative position indicated in dotted lines;

Fig. 3 is a view similar to Figure 2, the parts being shown however inthe positions which they occupy when the spool is in place;

Fig. el Figure 3;

Fig. 5 is a bottom plan view of the spool;

Fig. 6 is a top plan view of the blank which forms the top flange of thespool;

Fig. 7 is a top plan view of the blank which forms the bottom flange ofthe spool;

Figs. 8 and 9 are sections on lines 8-8 and 9-9 of Figures 6 and 7respectively;

Fig. 10 is a plan view of the blank form in which the core of the spoolis formed;

Fig. 1l is an edge View of the same;

Fig. 12 is a longitudinal section through a sleeve which forms portionot the spool;

Fig. 13 is an end view of the same;

Fig. 14; is a perspective view ot portion of the ribbon reversingmechanism;

Fig. 15 is a plan view ot the core or the spool just prior to assemblywith the top and bottom anges thereof; and

Fig. 16 is a section taken axially through a portion of the spool anddrawn to a relau tively large scale to show the manner in which theparts are secured together.

The main members ot the ribbon reversis a section on line fi-d ci? ingmechanism and their modes ont operation are fully described in my priorpatent above mentioned, and only so much. of the ribbon mechanism isillustrated in the drawings as is necessary to understand the manner ofits cooperation with the improved ribbon spool which is disclosed. Ttwill also be understood that the ribbon spools at both ends of thetypewriter are similar and the parts ot the ribbon mechanism immediatelyassociated with such spools, so that it is only necessary for a completeunderstanding et the present invention to illustrate and describe oneribbon spool and its associated mechanism.

A corner ot the trame or' the machine is indicated at 10, which trame isprovided with a stepped recess 1l having' a central boss l2 providedwith a vertical axial aperture 13 in which the ribbon spool shaft lit isrotatably supported. Shaft 14 has at its lower end a beveled gear l5which faces downwardly and which is adapted to mesh with a beveledpinion 16 on the vertically movable drive shaft i7 which extends fromtill titi

trent to rear of the machine and which is given a step by step rotarymovement by mechanism controlled by the operation or' the keys. Theupper end or shaft ll is two diametrically opposed and upwardlyextending teeth 19 thereon, and also has an axial internally threadedcylindrical recess 22.

A thumb screw is provided for detachably securing in place the ribbonspool S, the threaded spindle 21 of the thumb `screw extending through acentral opening 23 in the top flange 24 of the spool and the undersurface of the thumb screw bearing upon the margin of this opening andupon the upper end of sleeve 25 which surrounds the spool shaft 14 andthe upper end of which extends through opening 23 in flange 24. rlhissleeve is provided adjacent its upper end withan annular flange 26 andis secured to the flange 24 in any suitable manner, as

by welding or by a force fit. The lower end of the sleeve rests uponcollar 18 of shaft 14, and is provided with suitable notches to receivethe two teeth 19 extending upwardly from the collar..

The core of the spool S comprises. a cylindrical member 27 havingupwardly extending anges 28 at its upper end which extend throughopenings 24 in the upper flange 24 of the spool, and having downwardlyextending. flanges 29 at its lower end which extend through openings 30in the lower flange 30 of the spool. ltwill be seen that there are threeupper flanges 28 and four lower flanges 29 and that one flange in eachset is formed in two half portions located at the ends of the member 27,as shown in Figs. 10 and 15. The two parts of each of these splitflanges extend through a single opening in the adjacent spool flange andthe ends of member 27 are thereby secured in substantial abutment. rlheflanges 28 and 29 are headed over, as shown in Fig. 16, so that thethree main f portions of the spool are firmly secured together. The corehas a horizontally disposed elongated slot oropening 31. 'llhe bottomflange 30 is provided with a plurality of depressed portions 32 whichare elongated and the inner surfaces 33 of which comprise cam surfaces,adapted to coact with a moving member' mounted on the frame of themachine when the spool is being placed in position, as will hereinafterbe more fully explained.

Secured to the bottom of the cup-shaped depression-11 is a plate 35which is substantially lll-shaped and which is provided with paralleldownwardly extending arms 36 which pass through an opening 37 in theframe. lPivotally supported between these arms 36 is a rocker 38 whichhas an upwardly extending lever arm 39 and a downwardly extending leverarm 40. Lever arm 39 has a horizontal portion 41jat its upper end whichis horizontally opposite aperture 31 in the spool and which cooperatestherewith in effecting the reversal of the ribbon `spool at the propertime. Portion 41 is camshaped, as shown, and a spring 42 which has oneend secured to plate 35 and the other end bearing upon the upper edge ofthe rocker 38 normally tendslto force the cam 41 outwardly. `Suchoutward movement is prevented bythe ribbon wound on the spool so long assuch ribbon is present, but with the unwinding of the last coil ofribbon kfrom the core, spring 421 becomes effective to move the cam 41outwardly through openinl utward movement of the lever 39 of course,results in rotation of rocker 38 so that the horizontally extendingtooth 43 finds its way between the teeth of .the rotating pinion 16which, of course, has been disengaged from gear 15 while the spoolillus- Tated has been the feed spool or the unwinding s ool. Continuedrotation of shaft 17 in the irection of the arrow (Figure l) results inupward movement of pinion 16 and shaft 17 and at an intermediate pointin its upward travel a snapover mechanism (not illustrated) becomeseffective to quickly move it intoengagement with gear 15. rllhe spoolillustrated is then operatively connected to shaft 17 and becomes thedri-ven spool, its direction being reversed, andwithdra'wing ribbon fromthe spool at the opposite end of the machine, which spool has beenoperatively disconnected from the driving mechanism simultaneously withthe operative connection to' this mechanism of the spool illustrated.

When the ribbon has become exhausted a fresh ribbon is substituted byremoving that spool upon which the old ribbon has been completely woundand replacing it by a new spool having a fresh ribbon. To remove the oldspool'the thumb nut 21 is unscrewed and the spool lifted vertically up-yward, the end 41 of lever 39 moving inwardly as its edge rides over thelower edge of aperture'312and the inner edge of the bottom flange 30. Assoon as the spool has been removed spring 4 2 immediately tends toreturn cam 4l to the posit-ion in which it is illustrated in Figure 1,in which position it would interfere with the emplacement of a newspool. i

Means is provided, therefore, for 'moving the upper end 41 of lever 39inwardly toward shaft 14`when the spool is removed. rlhis meanscomprises a lever 50 mounted to swing or revolve about a vertical axis51 and provided with a coil spring 52, one end of which bears againstplate 35 and ythe other end against the downwardly extending flange 53of lever 50, which comprises an abutment therefore. Spring 52 acts onlever 50 in such manner that the end 54 of this lever tends to.constantly enga e lever 39 and to'force this lever toward s aft 14, the

agraria spring 52 being considerably stronger than spring 42 and ahhx toovercome the opposition of this last mentioned spring. The opposite endof lever 5() has a flange or eX- tension projecting vertically upwardand adapted te extend within the core of the spool as shown in Figures 1and 4.

lVhen the spool is lifted from the machine the parts assume thepositions in which they are illustrated in Figure 2. In replac ing thespool it is lowered over the shaft lt until the lower surface of itsbottom flange strikes the. upward projection 55 of lever 50, the cam lllbeing held of course. by this lever in its innern'iost position. Thespooly is then rotated about its axis until the end of flange. 55 liesbetween two of the. cams 32 of the spool and upon further rotation ofthe spool in either direction flange 55 is moved inwardly by one of thecam surfaces 33 into such position that it may enter a core, as shown inFigure 3, and when it has reached this position. the spool will drop toits lowermost or final position. The ribbon may now be attached to thespool at the opposite end of the machine. Rotation of lever 5b in aclockwise direction as just described, of course, allows cam 4l to moveoutwardly to opera-tively engage the inner surface. of the spool.-

ln Figures 5 to lll inclusive, the various component parts of' the spoolare illustrated before assembly. The top and bottom flanges and coreare. stamped from sheet met-al, the top flange having central andmarginal stiffeuing ribs and Gl, respec.- tively, and the bottom flangebeing provided with the cams At one end the blank is provided with anintegral point or catch 63 which is slightly offset and which issufficiently sharp to serve to catch and hold the end of theI ribbon. InFigure l5 the core is illustrated just prior to assembly with the topand bottom flanges, which assembly is effected preferably by headingover the tops of the tongues extending there from but may be doneotherwise if desired as by welding.

From the foregoing description of the in vention one skilled in the artwill appreci ate the advantages of the invention, and will realize thatit may be modified considerahly without departing from its spirit andscope.

Having thus described the invention what is claimed as new and desiredto be secured by Letters Patent is:

1. A typewriter' ribbn spool having a core and top and bottom flanges,the bottom flange having a central aperture, and a cam surface facinsaid central aperture and inclined to a. ra. ius passing therethroughfrom the center of said aperture, for directing a. coopera-ting membertoward the central aperture when the spool is rotated on a ribbon spoolshaft.

2. A. typewriter ribbon spool having a core and top and bottom flanges,the tbottom flange having a central aperture and oppositely directed camsurfaces each facing toward said central aperture and inclined to aradius therethrough from the center of the aperture,v for directing acooperating member toward said central aperture when the spool isrotated in either direction on a ribbon spool shaft.

3. A typewriter ribbon spool having a hollow core and top and bottomflanges, the bottom flange having a central aperture registering withthe hollow core and being provided with a cam surfare facing toward theaperture and extending outwardly from a point on the edge of saidcentral aperture.

l. A typewriter ribbon spool having a. hollow core and top and bottomflanges, the bottom flange having` a central aperture registering withthe hollow core, and being provided with two oppositely facing' camsurfaces extending outwardly from the central apcrtu re.

5. A typewriter ribbon Spool having a hollow core, and top and bottomflanges, the bottom flange having a. central aperture registering withthe hollow core, and being provided with four cams arranged at equalintervals around the central aperture, each 'am having two cam surfacessubstantially tangent t-o the. central openino at a common pointl andextending outward y therefrom.

G. A typewriter ribbon spool including upper and lower flanges and acentral core, said core comprising a curved metallic. strip provided,with flanges along its upper and lower edges which extend throughapertures in the upper and lower flanges of the spool, each corner ofthe strip being provided with one of said flanges and the two uppercorner flanges extending through a` single aperture in the upper spoolflange and the two lower corner flanges extending through a singleaperture in the lower spool flange, wl'iereby thel ends of the strip areheld in substantial. abutment.

ln testimony whereof l hereunto amig my signature.

CARL GABRELSUN

